Xutils3使用全解析
初始化及注解：
x.Ext.
init
(
this
);
//是否开启log，开启后将影响性能
x.Ext.
setDebug
(
true
);
注解的使用：
①//绑定空间及布局文件
@ContentView
(R.layout.
activity_main
)
public class
MainActivity
extends
AppCompatActivity {
@ViewInject
(R.id.
pgb
)
ProgressBar
bar
;
@ViewInject
(R.id.
img_test
)
ImageView
imgTest
;
@Override
protected void
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
x.
view
().inject(
this
);
}
②//绑定事件
/**
* 给每个按钮设置点击事件
*/
@Event
(value = {R.id.
btn_get
, R.id.
btn_post
, R.id.
btn_download
, R.id.
btn_upload
, R.id.
load_img
, R.id.
btn_db
})
private void
getEvent(View v) {
switch
(v.getId()) {
case
R.id.
btn_get
:
getMethod();
break
;
case
R.id.
btn_post
:
postMethod();
break
;
case
R.id.
btn_download
:
download();
break
;
case
R.id.
btn_upload
:
upload();
break
;
case
R.id.
load_img
:
loadImage();
break
;
case
R.id.
btn_db
:
useDb();
break
;
}
}
一：get请求：
/**
* get的请求方法
*/
public void
getMethod() {
RequestParams params =
new
RequestParams(
"https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/bd_logo1_31bdc765.png"
);
x.http().get(params,
new
Callback.CommonCallback()......}
二：post请求：
（上传表单或者上传json）
/**
* 使用xutils完成post请求
*/
public void
postMethod() {
RequestParams params =
new
RequestParams(
"https://www.baidu.com/?tn=62095104_oem_dg"
);
//上传表单
params.addBodyParameter(
"age"
,
"25"
);
//上传json数据----------------------------------------------------------------------------------
JSONObject object =
new
JSONObject();
try
{
object.put(
"name"
,
"23"
);
}
catch
(JSONException e) {
e.printStackTrace();
}
params.setAsJsonContent(
true
);
params.setBodyContent(object.toString());
//--------------------------------------------------------------------------------------------------
x.
http
().post(params,
new
Callback.CommonCallback() {............}
三：断点续传(下载):
public void
download() {
RequestParams params =
new
RequestParams(
"https://github.com/XXApple/AndroidLibs.git"
);
//下载文件完成放置的路径
params.setSaveFilePath(Environment.
getExternalStorageDirectory
() +
"/me/a.zip"
);
//是否自动命名
params.setAutoRename(
false
);
//是否断点续传
params.setAutoResume(
true
);
//开三个子线程进行下载，会更快
params.setExecutor(
new
PriorityExecutor(
3
,
true
));
//是否可以停止
params.setCancelFast(
true
);
x.
http
().get(params,
new
Callback.ProgressCallback() {........}
四：上传文件：
//上传的路径
RequestParams params =
new
RequestParams(
"xxxxxxx"
);
//是否是上传文件
params.setMultipart(
true
);
//本地文件的路径
params.addBodyParameter(
"file"
, Environment.
getExternalStorageDirectory
() +
"sdcard/a.mp4"
);
x.
http
().get(params,
new
Callback.CommonCallback() {......}
五：图片加载：
public void
loadImage() {
ImageOptions options =
new
ImageOptions.Builder().
setCrop(
true
).
setLoadingDrawableId(R.mipmap.
ic_launcher
).
setUseMemCache(
true
).
build();
x.
image
().bind(
imgTest
,
"https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/bd_logo1_31bdc765.png"
, options);
}
六：数据库：
一：对象中指定表名和列名，如下
@Table
(name =
"person"
)
public class
Person {
@Column
(name =
"id"
, autoGen =
true
, isId =
true
)
private int
id
;
@Column
(name =
"age"
)
private int
age
;
@Column
(name =
"name"
)
private
String
name
;
@Column
(name =
"price"
)
private int
price
;
二:初始化DbManager
private
DbManager.DaoConfig getConfig() {
DbManager.DaoConfig config =
new
DbManager.DaoConfig();
//数据库的路径
config.setDbDir(
new
File(
"sdcard/360"
)).
//是否允许事物
setAllowTransaction(
true
).
//数据库名
setDbName(
"test.db"
).
//数据库版本
setDbVersion(
1
).
setDbOpenListener(
new
DbManager.DbOpenListener() {
@Override
public void
onDbOpened(DbManager db) {
// 开启WAL, 对写入加速提升巨大
db.getDatabase().enableWriteAheadLogging();
}
}).setDbUpgradeListener(
new
DbManager.DbUpgradeListener() {
@Override
public void
onUpgrade(DbManager db,
int
oldVersion,
int
newVersion) {
}
}).setTableCreateListener(
new
DbManager.TableCreateListener() {
@Override
public void
onTableCreated(DbManager db, TableEntity table) {
}
});
return
config;
}
三：增
List persons =
new
ArrayList<>();
for
(
int
i =
0
; i <
5
; i++) {
Person person =
new
Person(i,
20
+ i,
"路人"
+ i,
10
+ i);
persons.add(person);
}
try
{
db
.saveBindingId(persons);
}
catch
(DbException e) {
e.printStackTrace();
}
四：删
try
{
//删除所有元素
db
.delete(Person.
class
);
//删除指定ID的元素
db
.deleteById(Person.
class
,
1
);
//删除指定元素
db
.delete(
new
Object());
//删除特定条件的元素
WhereBuilder builder = WhereBuilder.
b
();
builder.and(
"id"
,
"="
,
"2"
);
db
.delete(Person.
class
, builder);
}
catch
(DbException e) {
e.printStackTrace();
}
五：改
WhereBuilder builder = WhereBuilder.
b
();
builder.and(
"id"
,
"="
,
"1"
);
try
{
db
.update(Person.
class
, builder,
new
KeyValue(
"id"
,
10
),
new
KeyValue(
"price"
,
"999999999"
));
}
catch
(DbException e) {
e.printStackTrace();
}
六：查
try
{
long
a =
db
.selector(Person.
class
).count();
//查个数
Log.
e
(
"a"
,
"useDb: "
);
//查找所有元素
List list =
db
.findAll(Person.
class
);
Log.
e
(
"list"
,
""
+ list.size());
//查找指定ID的元素
Person person1 =
db
.findById(Person.
class
,
3
);
Log.
e
(
"person1"
,
""
+ person1.toString());
//按指定条件查找
List person2 =
db
.selector(Person.
class
).where(
"id"
,
"="
,
"4"
).findAll();
Log.
e
(
"person2"
,
""
+ person2.get(
0
).toString());
}
catch
(DbException e) {
e.printStackTrace();
}